Index Catalog // ScholarsArchive@OSU

Investigating Timescales of Resurgence at Large Calderas: Post-74 ka Activity at Toba Caldera, Sumatra, Indonesia

Creator:: Mucek, Adonara E.
Abstract:: The Toba Caldera Complex is the youngest resurgent caldera in the last 100 kyrs, formed from four overlapping eruptions starting 1.2 Myrs ago. The last caldera-forming eruption, the Youngest Toba Tuff eruption, occurred ~74 kyrs ago, emitting 2800 km3 of ash and pumice into the atmosphere and forming the caldera...
Resource Type:: Dissertation
Full Text:: . Abstract approved: ______________________________________________________ Shanaka L. de Silva The

Structure and Function of Foliar Fungal Communities of Populus trichocarpa Across its Native Range, Pacific Northwest, USA

Creator:: Barge, Edward G.
Abstract:: Foliar fungi – pathogens, endophytes, epiphytes – form taxonomically diverse communities that affect plant health and productivity. The composition of foliar fungal communities is variable at spatial scales both small (e.g., individual plants) and large (e.g., continents). However, few studies have focused on how environmental factors and host plant traits...
Resource Type:: Dissertation
Full Text:: wife, Charissa Bujak for providing unconditional love and support throughout. One Love, Edward G

New Applications for Passive Samplers : In-situ Flux and Risk Assessment of Legacy and Emerging Contaminants

Creator:: Tidwell, Lane G.
Abstract:: Passive sampling devices (PSDs) were used to measure air vapor and water dissolved phase concentrations of polycyclic aromatic hydrocarbons (PAHs) and oxygenated PAHs (OPAHs) at two different environmentally contaminated sites. Environmental contaminates like PAHs and OPAHs are present in both the atmospheric and aqueous environmental compartments. It is known that...
Resource Type:: Dissertation
Full Text:: upload_82316.docx AN ABSTRACT OF THE DISSERTATION OF Lane G. Tidwell for the degree of Doctor of

Diagnosis and Etiology of a Soilborne Disease Complex of Winter Squash (Cucurbita maxima) in the Willamette Valley, OR

Creator:: Rivedal, Hannah M.
Abstract:: Winter squash (Cucurbita maxima) grown in Oregon’s Willamette Valley for edible seed, frozen foods, and fresh markets is susceptible to an undiagnosed soilborne disease. Diseased squash fields exhibit symptoms of stunting, root and crown rot, vascular discoloration, and late-season wilt, which in extreme cases can lead to total crop failure....
Resource Type:: Dissertation
Full Text:: Hannah M. Rivedal Alexandra G. Stone Paul M. Severns Kenneth B. Johnson Phytobiomes 3340

Transcriptional networks controlled by the fatty acid regulators FAR-1 and FAR-2

Creator:: Bredeweg, Erin L.
Abstract:: Fungi are capable of growth on a wide variety of carbon sources, both living and dead. They can produce an arsenal of enzymes and transporters for harvesting sugars, polysaccharides, amino acids, lipids and micronutrients from their environments [1]. Within the nucleus of a cell, transcription factors (TF) control whether genes...
Resource Type:: Dissertation

Toward understanding the nature of the soil microsite in relation to nitrogen and carbon cycling

Creator:: Cliff, John B.
Abstract:: My research has focused on understanding N and C cycling in soils at small scales. Isotope dilution methods commonly used to estimate gross rates of soil chemical transformations assume homogeneous distribution of label. I explored the effects of diffusion limitations on isotope dilution experiments in soil aggregates using spherical diffusion-reaction...
Resource Type:: Dissertation
Full Text:: domain solutions were numerically inverted into the time domain using the algorithm of de Hoog et al

Hydro-biogeochemical coupling at the hillslope and catchment scale

Creator:: van Verseveld, Willem J.
Abstract:: The specific objectives of this dissertation are to determine subsurface flow behaviors across different antecedent wetness conditions from a top-down perspective and to mechanistically assess the hydrological controls on DOC and N transport at the hillslope and catchment scale. The study area is a small catchment where hillslopes issue directly...
Resource Type:: Dissertation
Full Text:: Water Resources Association, 34, 765-785. Boyer, E. W., G. M. Hornberger, K. E. Bencala, and D. M

Systematics and phylogeny of Cordyceps and the Clavicipitaceae with emphasis on the evolution of host affiliation

Creator:: Sung, Gi-Ho
Abstract:: Cordyceps is a genus of perithecial ascomycetes. It includes over 400 species that are pathogens of arthropods and parasites of the truffle genus Elaphomyces. Based on the morphology of cylindrical asci, thickened ascus apices and filiform ascospores, it is classified in the Clavicipitaceae (Hypocreales), which also includes endophytes and epiphytes...
Resource Type:: Dissertation
Full Text:: -517. Castlebury, L. A., A. Y. Rossman, G.-H. Sung, A. S. Hyten, and J. W. Spatafora. 2004. Multigene

The Nature of Sulfate Saturation in Oxidized Arc Magmas: Implications for Magmatic Sulfur Budgets

Creator:: Hutchinson, Michael C.
Abstract:: This dissertation is concerned with the behavior of sulfur in intermediate-silicic arc magmas associated with subduction at convergent margins. In particular it focusses on oxidized, sulfur-rich magmas, the conditions at which they might reach sulfate saturation, and implications of sulfate saturation. It is divided into an investigation of natural samples...
Resource Type:: Dissertation

Dissecting the cytoskeletal interaction during cytokinesis and the role of myosin II motors on homologous chromosomes

Creator:: Tseng, Kuo-Fu
Abstract:: Prior to cell cleavage, cytokinetic proteins are recruited into the nascent actomyosin contractile ring. Interactions between spindle microtubules and the cell cortex play a critical role in this recruitment. However, direct evidence for physical interaction between microtubules and the cortex has been lacking. Here we reveal the physical connection between...
Resource Type:: Dissertation
Full Text:: ends through de novo assembly. These actin filaments then are delivered to the equatorial cortex

ScholarsArchive@OSU

Investigating Timescales of Resurgence at Large Calderas: Post-74 ka Activity at Toba Caldera, Sumatra, Indonesia

Structure and Function of Foliar Fungal Communities of Populus trichocarpa Across its Native Range, Pacific Northwest, USA

New Applications for Passive Samplers : In-situ Flux and Risk Assessment of Legacy and Emerging Contaminants

Diagnosis and Etiology of a Soilborne Disease Complex of Winter Squash (Cucurbita maxima) in the Willamette Valley, OR

Transcriptional networks controlled by the fatty acid regulators FAR-1 and FAR-2

Toward understanding the nature of the soil microsite in relation to nitrogen and carbon cycling

Hydro-biogeochemical coupling at the hillslope and catchment scale

Systematics and phylogeny of Cordyceps and the Clavicipitaceae with emphasis on the evolution of host affiliation

The Nature of Sulfate Saturation in Oxidized Arc Magmas: Implications for Magmatic Sulfur Budgets

Dissecting the cytoskeletal interaction during cytokinesis and the role of myosin II motors on homologous chromosomes

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